“Stranger Things,” one of Netflix’s most popular series to date, began production season one more than three years ago. The risk of any series focused on youth is the kids grow up, for better or worse. It’ll be interesting to see how the series copes with that if Netflix and the Duffer brothers choose to go more than three seasons.

Caleb McLaughlin, who plays Lucas, is already 17. Breakout star Millie Bobby Brown, who plays Eleven, is almost 15. Gaten Mattarazzo, who plays Dustin, is 16. Noah Schnapp, who plays Will, is the youngest at 14. Finn Wolfhard, who plays Mike, just turned 16. Sadie Sink, who plays Max, is also 16.

NEW YORK, NY - NOVEMBER 20: UNICEF today appointed Emmy-Nominated actress Millie Bobby Brown as its youngest-ever Goodwill Ambassador on World Children's Day on November 20, 2018 in New York City. (Photo by Cindy Ord/Getty Images for UNICEF)

Photo: Cindy Ord/Getty Images for UNICEF

The Duffers are known as auteurs who like to get things right. Fortunately, Netflix is not bound by the strictures of broadcast TV so it could time the show’s release to whatever it felt was best. And this gives the producers plenty of time to finish post-production.

Netflix released a “teaser” featuring this week with clips from 1985’s Dick Clark’s Rockin’ Eve.

And here’s the promo poster:

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